Optical Bonding
1. Optical Bonding Services
2. New To Bonding
3. Optical Bonding Technologies
4. Quick Tour for Industrial lcd pro Bonding product
1. Optical Bonding Services
| Optical Bonding Services |
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| Demand Creation through Innovation! |
Welcome to Indusrial LCD Pro Bonding Laboratories!! Maybe you are quite new to Indusrial LCD Pro, or maybe you are our old friends. We would like to share you great news: Indusrial LCD Pro has launched a new production line, clean room, and bonding laboratories for Optical Bonding. Our vision is to build up new standards through our innovations that can create much more added-values for our customers. We welcome you to join us to share the enormous opportunity ahead of us!
Reduce Reflection, Improved Clarity, Contrast, Ruggedness
If you are not familiar with Optical Bonding, or you are not sure what this can benefit to you, please click here to know some basic ideas about our bonding:
 New To Optical Bonding
If you are already an expert of optical bonding, you want to know the background theories we have developed want to do some math caculation, please click here:
Optical Bonding Technologies
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Here are the product ranges that our Optical bonding can service for you:
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2. New To Bonding
| New To Bonding |
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What is Optical Bonding?
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- Optical Bonding use liquid gel to laminate/ affix the cover glass or touchscreen on the front of the LCD panel. The air gap between the cover glass and the panel is completely filled with silicon-based gel/ adhesive. The assembly is cured in a process that affixes the panel together while solidifying the adhesive
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| Comparison |
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- The two main reasons for optically bonding a TFT panel to a cover plate are to improve optical performance and durability. By selecting appropriate adhesive that closely matches the index of refraction of the panel and the cover plate, it will thus reduce the number of internal reflecting surfaces that can lead to degradation of optical performance. Providing a durable adhesion between the flat panel and the cover plate improves the displays’ ability to resist shock, vibration and moisture.
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| Benefits–Better Viewability in bright ambient conditions |
- Optical bonding reduces the reflection caused by glass or air
- Reduces unwanted glare effects and mirror images that make the display difficult to read
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Benefit–Improves Ruggedness
- Optical bonding improves impact/scratch resistance!
- Adhesive provides adequate bond strength to prevent safety issues of broken glass
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| LCD Panels have plastic surfaces that are not vandal or weatherproof. To protect your display investment, most display installations require a glass to protect the LCD. Optical bonding can help solve the problem of reflection caused by glass while provide adequate bond strength to help on safety concerns on broken glass. |
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Benefit–Increases Anti-Shock/ Vibration Capabilities
- Optical bonding increases resistance to mechanical shock and vibration!
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| Optical bonding is an effective means of improving resistance to shock and vibration. This is especially useful for military and transportation applications. |
Benefit–Prevents Condensation |
| Filling the gap between the protective glass and panel keeps out dust and moisture. Condensation or dust can make a display unreadable. |
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| Target Application Markets |
- Transportation
- Navigation
- Outdoor kiosk
- Gas pump
- Maritime application
- Avionics application
- Rugged Tablet PC
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Benefits
- Prevents condensation and fogging in high humidity, salt water
- Improves outdoor readability
- Increases durability to withstand wide temperature, shock and vibration
- Increases impact and resistance
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3. Optical Bonding Technologies
| Optical Bonding Technologies |
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| Innovations & Standards Creation |
| 1. Main Factors affecting Outdoor readability |
Why you cannot see the display near the sunlight? We have listed some major factors that affect your display’s readability near sunlight. And our corresponding solutions.
Reflection of light may be specular (that is, mirror-like) or diffuse (that is, not retaining the image, only the energy) depending on the nature of the interface. |
 Too dark! |
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- Need Brightness enhancement
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i.Transflective
ii.High Brightness
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Glare/ Mirror image!!
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- Need to reduce reflection
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i.Optical bonding with AR glass
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Color wash-out!!
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- Need to reduce reflection
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i.Optical bonding with AR glass
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Optical bonding helps you to reduce the Reflection Problem
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| 2. How does Reflection happen? |
Optical bonding is mainly dealing with the Reflection. Now let’s look more detail on how reflection happens and the law of reflection. Reflection is the change in direction of a wave front at an interface between two different media so that the wave front returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.
Reflection of light may be specular (that is, mirror-like) or diffuse (that is, not retaining the image, only the energy) depending on the nature of the interface. |
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Specular reflection, souce:
http://en.wikipedia.org/wiki/Reflection_%28physics%29 |
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Diffuse reflection, source:
http://en.wikipedia.org/wiki/Reflection_%28physics%29 |
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When light moves from a medium of a given refractive index n1 into a second medium with refractive index n2, both reflection and refraction of the light may occur.
Refraction of light waves in water. The dark rectangle represents the actual position of a pencil sitting in a bowl of water. The light rectangle represents the apparent position of the pencil. Notice that the end (X) looks like it is at (Y), a position that is considerably shallower than (X). |
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| Variables used in the Fresnel equations. |
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| Law Reflection |
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- It states that the direction of incoming light (the incident ray), and the direction of outgoing light reflected (the reflected ray) make the same angle with respect to the surface normal, thus the angle of incidence equals the angle of reflection; this is commonly stated as θi = θr.
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Law of Refraction (Snell's Law)
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- Snell's law states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of velocities in the two media, or equivalently to the inverse ratio of the indices of refraction:
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| 3. How much Reflection happens? |
| The reflection is caused by the difference between material’s refractive index. The larger the difference, the bigger the reflection happens. |
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4.How Optical bonding can help reduce Reflection ? |
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By using the Adhesive whose refractive index is very close to Glass and Panel (Polarizer glass), it can help to reduce the reflection happen when light transmit through glass and panel. |
| Calculation of reflection: |
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i.Vacuum air -- 1,
II.glass – 1.5
iii.Adhesive – 1.474 |
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- he reflection between the glass and the adhesive is close to 0%.
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| 5.Reduce Reflection help improve Contrast |
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Now you have known that our optical bonding can help to reduce the reflection. Furthermore, we will show you how the reduction of the reflection and help improve the “extrinsic” contrast ratio and therefore help the outdoor visibility. |
- “Brightness” lightens or darkens the image. “Contrast” changes the distinction between the light and dark areas.
- The human eye eventually becomes saturated with brightness and becomes more responsive to contrast.
- Contrast ratio is much more significant than brightness in high ambient illumination environments.
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Reference data source:
http://en.wikipedia.org/wiki/Reflection_%28physics%29
http://en.wikipedia.org/wiki/Refraction
http://en.wikipedia.org/wiki/Refractive_index
http://en.wikipedia.org/wiki/Fresnel_equations |
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4. Quick Tour for Indusrial LCD Pro Bonding product
| Quick Tour for Indusrial LCD Pro Bonding product |
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| Comparison among other solutions |
How to choose between Indusrial LCD Pro’s different solutions of improving Sunlight readability?
Indusrial LCD Pro offer different approach to enhance the display to have better viewability near sunlight. Depends on your application scenes, different technology will be use to solve the problems caused by bright lights.
Here is the Comparison table among solutions
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| Why choose Indusrial LCD Pro? |
- Indusrial LCD Pro provide in-house capability of design and manufacturing for optical bonding
- We are flexible to apply this technology to our current display/ touch display/ panel pc/ Rugged solution
- We provide component solution as well as system level solution (with Tested/ Certified products!)
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| Our new in-house facility to provide optical bonding of TFT displays. In addition to providing optical bonding services, Indusrial LCD Pro is enhancing many of its specialized monitors requiring data legibility in bright ambient environments, including products for the marine market to include this feature. The offerings are also particularly beneficial for transportation and outdoor kiosk applications that use TFT displays in high ambient conditions. |
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| Why would someone need optical bonding? |
TFT displays are traditionally mounted with protective cover glass or touch screens,
adding layers to the optical path which can create reflections, glare and image
distortion. This also requires the display to have a more powerful backlight in order
to compensate for decreased readability in bright environments. Optical bonding uses a
silicone-based adhesive instead to add the cover glass or touch screen, which
ultimately increases display contrast and also seals and protects the display.
Optically-bonded displays also require less backlight wattage, which decreases heat,
improves product reliability and lessens energy consumption. Finally, for battery-
powered products, decreasing the power required to illuminate the backlight helps avoid
excessive battery drain
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Why would Optical bonding help to improve Contrast Ratio of the display?
Contrast ratio of a display in high ambient lighting levels requires that both specular
and diffuse reflections from the display be carefully controlled. These can be
minimized by the use of AR coatings on the front surface of the display. For LCD
display, this cannot easily be directly applied because the depositions must be done
under conditions which will severely degrade the display materials.
Therefore, a secondary optical element must be considered, which can be a glass cover
plate that has the antireflection coating applied to it. However, if this glass cover
plate is merely physically mounted in front of the LCD, there are still major
reflection problems. The inherent LCD reflection is unaffected and reflections from the
rear surface of the overlay will worsen the situation. Optical bonding can reduce these
unwanted reflections.
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Does optical bonding change a display’s optical characteristics or operating temperature range?
No. Optical bonding only alters the surface of the display rather than the components,
so the optical characteristics or operating temperature will not change.
What applications can benefit from optical bonding?
Any display in an outdoor environment or high ambient light conditions can be improved
with optical bonding. Example applications include in-vehicle displays and digital
signage, defibrillators, marine displays and in-flight entertainment systems.
Where does the optical bonding process occur?
Indusrial LCD Pro's optical bonding laboratory is located in Taiwan. The facility includes a
class 10,000 clean room with focused workstation environments of Class 1000 to ensure
proper handling of your displays during the enhancement process. We welcome visitors to
our facility and will gladly show off our optical bonding and other display enhancement
capabilities.
Will optical bonding be available on your standard products?
Yes. Indusrial LCD Pro has a wide array of standard catalog items across a variety of
applications and display technologies. Almost all of our standard products can include
our optical bonding service.
Has any reliability testing of the bonding process?
Yes, we have tested the critical performance metrics to a battery of military
environmental and industrial standards, which include temperature cycling and
temperature shock extremes, humidity, mechanical shock and vibration, liquid and dust
ingress. |
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